Metameria or compensation isomeria
This isomerism occurs between isomers that belong to the same function but differ in the position of a heteroatom in the carbon chain.
The heteroatom must always be between carbons.
Occurs when isomers belong to different functions. The most common isomers for this type of isomerism are:
- alcohol and ether
- aldehyde and ketone
- carboxylic acid and ester
- alcohol and ether: C2H6O
- aldehyde and ketone: C3H6O
- carboxylic acid and ester: C4H8O2